URGENT help required. BBM7 missing after OS upgrade! :(

I urgently require your help. I have seen some similar topics posted but none exactly the same as mine so I would really really appreciate if anyone can very kindly help me out.

I have a major problem on the Blackberry Bold 9900.

A few days ago I updated my Blackberry Messanger (BBM only) to BBM7. Everything was working fine.
Then last night I got a message on my phone to upgrade my operating system to OS 7 which I installed.
Then this morning I noticed that my BBM has disappeared from my phone and I can't find it.
I currently have 7.1.0 Bundle 2061

(Also note that BB App world wont give me the option to download BBM and trying to download other apps also freezes the app world)

IF anything, your contacts won't be lost. It will be in your backup file on your BDM. Also, since you updated to BBM7, it is now backed up online too.
I would security wipe if app world is having problems too.
That should reset everything back to normal. Whatever isn't loaded should be able to download in app world.

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